// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SHILL_L2TP_IPSEC_DRIVER_H_
#define SHILL_L2TP_IPSEC_DRIVER_H_

#include <sys/types.h>

#include <map>
#include <memory>
#include <string>
#include <vector>

#include <base/files/file_path.h>
#include <gtest/gtest_prod.h>  // for FRIEND_TEST

#include "shill/ipconfig.h"
#include "shill/rpc_task.h"
#include "shill/service.h"
#include "shill/vpn_driver.h"

namespace shill {

class CertificateFile;
class ControlInterface;
class DeviceInfo;
class ExternalTask;
class GLib;
class Metrics;
class PPPDeviceFactory;

class L2TPIPSecDriver : public VPNDriver,
                        public RPCTaskDelegate {
 public:
  L2TPIPSecDriver(ControlInterface *control,
                  EventDispatcher *dispatcher,
                  Metrics *metrics,
                  Manager *manager,
                  DeviceInfo *device_info,
                  GLib *glib);
  ~L2TPIPSecDriver() override;

 protected:
  // Inherited from VPNDriver.
  virtual bool ClaimInterface(const std::string &link_name,
                              int interface_index);
  virtual void Connect(const VPNServiceRefPtr &service, Error *error);
  virtual void Disconnect();
  virtual std::string GetProviderType() const;
  virtual void OnConnectionDisconnected();
  virtual void OnConnectTimeout();

 private:
  friend class L2TPIPSecDriverTest;
  FRIEND_TEST(L2TPIPSecDriverTest, AppendFlag);
  FRIEND_TEST(L2TPIPSecDriverTest, AppendValueOption);
  FRIEND_TEST(L2TPIPSecDriverTest, Cleanup);
  FRIEND_TEST(L2TPIPSecDriverTest, Connect);
  FRIEND_TEST(L2TPIPSecDriverTest, DeleteTemporaryFiles);
  FRIEND_TEST(L2TPIPSecDriverTest, Disconnect);
  FRIEND_TEST(L2TPIPSecDriverTest, GetLogin);
  FRIEND_TEST(L2TPIPSecDriverTest, InitEnvironment);
  FRIEND_TEST(L2TPIPSecDriverTest, InitOptions);
  FRIEND_TEST(L2TPIPSecDriverTest, InitOptionsNoHost);
  FRIEND_TEST(L2TPIPSecDriverTest, InitPEMOptions);
  FRIEND_TEST(L2TPIPSecDriverTest, InitPSKOptions);
  FRIEND_TEST(L2TPIPSecDriverTest, InitXauthOptions);
  FRIEND_TEST(L2TPIPSecDriverTest, Notify);
  FRIEND_TEST(L2TPIPSecDriverTest, NotifyWithExistingDevice);
  FRIEND_TEST(L2TPIPSecDriverTest, NotifyDisconnected);
  FRIEND_TEST(L2TPIPSecDriverTest, OnConnectionDisconnected);
  FRIEND_TEST(L2TPIPSecDriverTest, OnL2TPIPSecVPNDied);
  FRIEND_TEST(L2TPIPSecDriverTest, ParseIPConfiguration);
  FRIEND_TEST(L2TPIPSecDriverTest, SpawnL2TPIPSecVPN);

  static const char kL2TPIPSecVPNPath[];
  static const Property kProperties[];

  bool SpawnL2TPIPSecVPN(Error *error);

  bool InitOptions(std::vector<std::string> *options, Error *error);
  bool InitPSKOptions(std::vector<std::string> *options, Error *error);
  bool InitPEMOptions(std::vector<std::string> *options);
  bool InitXauthOptions(std::vector<std::string> *options, Error *error);

  // Resets the VPN state and deallocates all resources. If there's a service
  // associated through Connect, sets its state to Service::kStateIdle and
  // disassociates from the service.
  void IdleService();

  // Resets the VPN state and deallocates all resources. If there's a service
  // associated through Connect, sets its state to Service::kStateFailure with
  // failure reason |failure| and disassociates from the service.
  void FailService(Service::ConnectFailure failure);

  // Implements the IdleService and FailService methods. Resets the VPN state
  // and deallocates all resources. If there's a service associated through
  // Connect, sets its state |state|; if |state| is Service::kStateFailure, sets
  // the failure reason to |failure|; disassociates from the service.
  void Cleanup(Service::ConnectState state, Service::ConnectFailure failure);

  void DeleteTemporaryFile(base::FilePath *temporary_file);
  void DeleteTemporaryFiles();

  // Returns true if an opton was appended.
  bool AppendValueOption(const std::string &property,
                         const std::string &option,
                         std::vector<std::string> *options);

  // Returns true if a flag was appended.
  bool AppendFlag(const std::string &property,
                  const std::string &true_option,
                  const std::string &false_option,
                  std::vector<std::string> *options);

  static Service::ConnectFailure TranslateExitStatusToFailure(int status);

  // Returns true if neither a PSK nor a client certificate has been provided
  // for the IPSec phase of the authentication process.
  bool IsPskRequired() const;

  // Inherit from VPNDriver to add custom properties.
  virtual KeyValueStore GetProvider(Error *error);

  // Implements RPCTaskDelegate.
  virtual void GetLogin(std::string *user, std::string *password);
  virtual void Notify(const std::string &reason,
                      const std::map<std::string, std::string> &dict);
  // Called when the l2tpipsec_vpn process exits.
  void OnL2TPIPSecVPNDied(pid_t pid, int status);

  void ReportConnectionMetrics();

  ControlInterface *control_;
  Metrics *metrics_;
  DeviceInfo *device_info_;
  GLib *glib_;
  PPPDeviceFactory *ppp_device_factory_;

  VPNServiceRefPtr service_;
  std::unique_ptr<ExternalTask> external_task_;
  base::FilePath psk_file_;
  base::FilePath xauth_credentials_file_;
  std::unique_ptr<CertificateFile> certificate_file_;
  PPPDeviceRefPtr device_;
  base::WeakPtrFactory<L2TPIPSecDriver> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(L2TPIPSecDriver);
};

}  // namespace shill

#endif  // SHILL_L2TP_IPSEC_DRIVER_H_